Electric-arc lamp



(No Model.)

O. W. ADAMS.

ELECTRIC ARC LAMP. No.- 380,271. H Patented Mar UNITED STATES PATENTOFFICE.

CHARLES W. ADAMS, OF CHELSEA, ASSIGNOR OF THREE-FOURTHS TO ARTHUR B.RROWNE AND EDGAR HARDING, BOTH OF CAMBRIDGE,

MASSACHUSETTS.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 380.271, dated March27, 1888.

Application filed October 6, 1887. Serial No. 251,646. (No model.)

' of Chelsea, in the count-y of Suffolk and Commonwealth ofMassachusetts, have invented a new and useful Improvement inElectric-Arc v Lamps, of which the following, taken in conncction withthe accompanying drawings,'is a specification.

In many clutch regulated lamps, a washer, through which a feed-rodpasses, is attached to and receives its motion from an armature, andupon receiving such motion said washer clamps the feedrod in oppositesides and raises it. There is aserious objection to this mode ofoperation, namely, the necessity for making the opening fit the rodclosely, and the feed-rod in consequence often becomes jammed orabraded; hence u nsteadiness in the light follows.

The object of my invention is to overcome any such objection by using,in connection with said lamp, a tilting clutch, which will bend andraise the feed-rod sufficiently to form an electric arc, and afterwardwill regulatethe motion of the feed-rod according to the current ofelectricity passing through the lamp.

In the accompanying drawings, Figure 1 is a side view, partly insection, of an electricarc lamp. Fig. 2 is a front view of same. Fig. 3is a perspective view of a tilting clutch.

In Fig. 3, A represents the feed-rod of an electric-arc lamp, and Brepresents a part ofa tilting clutch, and consists of a piece of metalor other suitable material, having an opening, C, for the insertion offeed-rod A, and having on one end slot E,extcnding into said opening Cand being connected at the opposite end to the stationary piece K by thelinks I I.

F represents a clamping-lever Working in slot E, being pivoted near oneextremity at G, and at the other extremity, in any convenient manner,but preferably by small connecting link L, to the armature M.

Y represents an adjustable or stationary stop, and is connected with theframe of said lamp at Z.

The operation of said tilting-clutch mechanism is as follows: Thearmature M being attached by the action of the electric current passingthrough the lamp, raises,through the agency of L, the clamping-lever F,causing it to pivot at G, and at the same time to bind its upper end inthe feed-rod A. Then the parts B and F, composing the tilting clutch,turn on the pivots connecting the small bars I I with the stationarypiece K, thereby lifting the feedrodA and forming the electric arc.\Vhen the electric current causes the armature M to drop, the feed-rod Ais at the same time lowered until part B comes in contact with theadjustable or stationary stop Y, thereby causing clamping-1ever F toloosen its hold on feed rod A,which then descends by its own weight.

What I claim is 1. In an electric-arc lamp, a perforated and slottedclutch, B, at one end permanently connected by a slotted joint and pivotwith and tilting upon a stationary piece, as K, and again, at itsopposite end, pivoted to'a clampinglever, F, the same to be used inconnection with a feed-rod, A, substantially as shown and described.

2. In an electric-arc lamp, a tilting clutch consisting of a piece ofmetal or other suitable material, B, having an opening, C, and at oneend a clamping-lever, F, of same material as above, pivoting atG in slotE, and again at its connection with link L, and at its opposite endbeing connected to the stationary piece K by links I I, the said clutchresting on adjustable stop Y, substantially as shown and described.

3. In an electric-arc lamp, the combination of a tilting clutchconsisting of aslotted piece, B, the opening C,the clamping-lever F, theconnecting-link L, the armature M, the small links I I, the stationarypiece K, and the adjustable stop Y,With the feed-rod A, substantially asshown and described.

In testimony whereof I have signed my name to this specification,in thepresence of two subscribing witnesses,on this 29th day of September, A.D. 1887.

CHARLES W. ADAMS.

Witnesses:

CONRAD RENO, MILAN F. SrEvENs.

